â–¡ Not included with the vehicle sale. A Utah motor vehicle bill of sale, known as Form TC-843, is an official document that provides proof that a vehicle has been sold in the State of Utah.Edit, sign, and share utah bill of sale filled out example online. No need to install software, just go to DocHub, and sign up instantly and for free. Although not legally required, the Utah DMV advises and provides private sellers with a bill of sale (form TC-843) to use when selling your car on your own. Create a Utah bill of sale form to document the transfer of ownership of a vehicle or another piece of personal property. A Utah motor vehicle bill of sale is written documentation of a transfer of vehicle ownership.